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Một cửa hàng gạo bán hết số gạo của mình trong 3 ngày. Ngày thứ nhất bán được 3/7 số gạo của cửa hàng . Ngày thứ hai bán được 25% số gạo bán ngày 1. Ngày thứ ba bán được 26 tấn. a) Ban đầu cửa hàng có bao nhiêu tấn gạo? b) Tính số gạo mà của hàng bán được trong ngày 1, ngày 2 c) Số gạo cửa hàng bán được trong ngày chiếm 1 bao nhiêu % số gạo của cửa hàng?
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